Effects of common carp Cyprinus carpio (L.) and feed addition in rohu Labeo rohita (Hamilton) ponds on nutrient partitioning among fish, plankton and benthos
The effects of introducing common carp (CC) and of adding artificial feed to fertilized rohu ponds on water quality and nutrient accumulation efficiency were studied. All ponds were stocked with 15000 rohu ha-1. Treatments included ponds with rohu alone, rohu plus 5000 common carp ha-1 and rohu p...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley-Blackwell
2008
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/3236/ http://irep.iium.edu.my/3236/ http://irep.iium.edu.my/3236/ http://irep.iium.edu.my/3236/1/Nutrients_partitioning_among_plankton%2C_fish_and_benthos.pdf |
| Summary: | The effects of introducing common carp (CC) and of
adding artificial feed to fertilized rohu ponds on water
quality and nutrient accumulation efficiency were studied.
All ponds were stocked with 15000 rohu ha-1. Treatments included ponds with rohu alone, rohu plus 5000 common carp ha-1 and rohu plus 10000CC ha-1. Acomparisonwas alsomade between supplementally fed and non-fed ponds. The overall
highest nitrogen (N) and phosphorus (P) concentrations
were observed in ponds with 5000 CC ha-1, followed
by ponds with 10000 and 0 CC ha-1. The largest fractions of Nand Pinputs accumulating in fish, phytoplankton and zooplankton were observed in ponds with 5000 CC ha-1, followed by ponds with 10000CC ha-1 and subsequently ponds without CC. Relatively more nutrients accumulated in benthic
organisms in ponds without than in ponds with CC.
A smaller fraction of the nutrient input was retained
in fish, plankton and benthic organisms in pondswithout
CC compared with ponds with CC. Compared with
5000 CC ha-1, stocking10000 CC ha-1 canbe considered
as overstocking, because this leads to lower ¢sh
production and relatively less nutrients retained in
plankton and benthic organisms. |
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